Jam-nut.



COBNELIUS BURNS, OF BURNSIDE, PENIN'SYLVANIA.

JAM-HUT. l

Specification of Letters Patent.

Application flled .Tune 1,

Patentied Mar. 22, 1910.

1909. Serial No. '199.361`

To all whom 'it may concern:

Be it known that l, (lonxmims Bonus, a citizen of the United States, rcsiding at liurnside, in the. countv of (llearlield and State of Pennsylvania,have invented a new and useful .lam-Nut, ol' which the following is a specification.

This invention has relation to jam nnts and it consists in the novel construction and arrangements of its parts-` as hercinafter shown and described.

The object of the invention is to provide a simple and an etl'eclivl` means for januning a nut in position upon tluI thrcad of a boll'; and, with this object in view, the device consists in providing:r a flexible annulus, which is adopted to snugly receive the holt, and in providingr in the under face of the nut a recess adaptcd to receive one end porlion of the said annulus'. The recess in the inner face of the nut is provided with an annular side-wall which couverges' toward the center of the nut. The said recess is also provided with a bottom Wall, which is slightly1 concaved, or snbstantiall so. The side' wall of the recess is provided, at suitable intervals, with notche's or indentations. The sides and bottom of the said recess are so positioned that when the flexible annulus is subjected to pressure, itwill ybe forced in and seeurely seated in engagement With the thread of the bolt, and at the same time the outer yportion of the said annulus will be forced into the notches in the side-wall of the recess of the nut; thereby affordin a looking means, and, inasmuch as the annufi ble material, such as rubber, it Will rotectr the thread of both the nut and the bo t from rustandthe elements of weather.

Figure 1 is a side elevation of a bolt with 'the jam nut device shown in section. Firr 2 is a perspective view of the end of the iiolt and an annulus fused in the jam nut device located thereon, and, Fig. 3 is a perspective view of a nut used in the device.

The elements eomposing the component parts of the jam nut mechanism include a flexible Washer or annulus, 1, Which is adapts ed to snugly fit over the threaded portion of a bolt, 2. The said annulus ma be made of rubber, or any other suitable exible matel .rial. The nut 3, is provided in its inner or under face with a concentric recess, 4. The recess 4 is provided with a side-wall 5,1which is annular, and which c'onverges toward .the center of the nut.. The said recess 4, is also isis composed of llexi' lprovidcd With a bottom Wall (5, which is slightly coucaved or suhstautially so. The side-wall 5, of the recess 4, is provided With the indentutions 7.

The parts of the jam-nut device are ap- `plied and assemblcd as follows z-f-Thc holt 2, is first passed through the. holt perforation in a support or object. The annulus 1, is then slipped on the threaded portion of the bolt 2. The nut 3, is then screwed upon the threaded portion of the holt, 2, and as tluI said nut'. moves along the thread of the said bolt, toward the head of the holt` the vecess 1. The iuclincd side wall 5, of the rei-css Vl` will Compress that portion of the said annulus Which enters the recess, and will force the same. laterally into the thread of the bolt 2, and the indentations T, in the said side- Wall 5, of the recess 4. Then, however` the bottom wall (3, of the recess 4, comes in contact with the end of the annulus 1, the said annulus may be moved longitudinall)v along the bolt 1, until its'inner end comes in conA 4tact With the support or object through Which the said bolt passes. When this oecurs, and as the said nut, 3, continues to move longitudinally along the holt 2, the annulus 1, is compressed longitudinally, and by reason of the fact that the bottom Wall 6, is dished, or slightly concaved, the extreme end portion of the annulus 1` Which lies within the recess 4, Wil] he shunted or directed in a precipitous manner toward the thread of the bolt 2, and, eventually, will be firmly seated in the said thread and portions of 'the said annulus will be forced into the thread` of the nut 3. Thus it will be seen that the annulus 1, is compressed both laterally and longitudinally, and the effect of both processes of compression is to firlnly seat the material of which the annulus is composed in the'thread of the holt. This has the eflect, of providing a. simple and efl'ectual jam nut mechanism, and also by reason of the fact that the said annulus is Kforced :into such close contact with the thread 'of both thevbolt and nut, the threads of the Said parts Will be protected from moisture and the. Weather. The inner surface portions of thefinnulns 1, which engage the thread of the bolt 2, serve to form a posifive connection between the said annulus and the holt, while the Outer portions of the said annulus which enter the indentations 7, provided in the wall 5, of the recess 4, serve as 4, cventua1l \V receivcs the end of the annulus (iii a positive connection between the said annulus and the nut. Therefore the nut and the bolt become locked in their relative positions With relation to each other while the annulus is compressed to the fullest extent, us above described.

Having described my invention, what I claim as new, and desire to secure by Letters Patent is In :1 combination with a. threaded bolt a jam nut device comprising an annullis of flexible material snugly fitted upon the threaded portion of the bolt, a nut having a threaded bolt perforation adapted to engage the thread of the bolt, said nut being providedupon its inner face With a eoncentric recess, said recess having an annular side Wall Which converges toward the center of the nut, said recess also having Within said annular side wall a substantially concaved bottom wall, said side Wall having indentations the inner ends of Which project into the concaved bottom Wall but terminate short of the threaded bolt perforation said recess being adapted to receive the en portion of the annulus and the walls thereof being adapted to direct the end portions of the annulus at different angles toward the thread of the bolt.

I-n testirhony that I claim the foregoing as my own, I have hereto aflixed my signature in the presence of two Witnesses. 4

` CORNELIUS BURNS. VVitnesses:

VV. H. MCONNKING, J. C. W'EITZEL. 

